National and State Chapters
- Trout Unlimited: www.tu.org
- Colorado TU: www.cotrout.org
State and Federal Agencies
- CDOW: http://wildlife.state.co.us/
- Rocky Mountain National Park: www.nps.gov/romo/
- US Fish and Wildlife: www.fws.gov
- National Forest Service: www.fs.fed.us/
- BLM: www.blm.gov/
- USGS: www.usgs.gov/
- Colorado Department of Natural Resources: www.dnr.state.co.us/
- Colorado State Parks: www.parks.state.co.us/
- Boulder County Open Space: www.co.boulder.co.us/openspace/
- Longmont Open Space Program: www.ci.longmont.co.us/openspace/index.htm
Fish and Stream Protection
- Whirling Disease: www.whirling-disease.org
- Aquatic Hitchiker: www.protectyourwaters.net